Hundreds of Marilyn Monroe impersonators have claimed a new world record on a sweltering Adelaide day before going for a dip in the ocean to raise tens of thousands of dollars for cancer research.

Marilyn Jetty Swim organisers said about 270 women, men and children dressed as the Hollywood icon at Brighton beach this morning, enough for Guinness to create the new record of most people dressed as Marilyn Monroes in one location.

They were all dolled up in the star’s iconic white frock with wigs and make-up, including her distinctive beauty mark.

Organiser Sarah Tinney said there were even more people interested in dressing up, but she had to turn them away because there simply were not enough wigs in Adelaide.

“Pretty much we have sold out of every decent wig – and bad wigs – out of SA,” Ms Tinney said.

“We have got them from Murray Bridge, from very far and wide.

“We are looking for wig sponsors – we need to get wigs and swimsuits in.”

Photos were taken of each individual Marilyn as well as a group photo of what was dubbed the “gaggle” of Marilyns, which will be sent to Guinness World Records as evidence of the event.

The event is in its sixth year, but this was the first time a record attempt was made.

Men were able to participate in the Marilyn Jetty Swim for the first time this year. Photo: ABC News

Up to $100,000 to be raised for cancer

Organisers said about $65,000 had already been raised this year for the Cancer Council SA, and they were on track to top $100,000 in total.

Many of the Marilyns have gone through – or are currently living through – cancer treatment themselves.

“Most people on the planet unfortunately have been quite directly affected by cancer in some way,” Ms Tinney said.

“One of our swimmers couldn’t compete today because she felt unwell and couldn’t enter the water.”

Participants all dolled up before their swim. Photo: ABC News

The gathering of the Marilyns has been held on the sidelines of the Brighton Jetty Classic ocean swim every year since 2014, but this swim is far from an athletic competition.

The participants paddled around the jetty at a slow pace, crossing the finish line as one group while holding hands.

“It’s a sisterhood … we actually get ready at my house nearby,” Ms Tinney said.

“We have a team of make-up artists that help us get this look.”

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Ms Tinney said the male Marilyns, who were welcomed into the event for the first time this year, fit in well.

“My wife’s been suffering breast cancer for the last year, so this is a real celebration, her prognosis is really good,” bearded Marilyn Phil Hodgson said.

–ABC